36 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2#include <stddef.h>3#include <linux/bpf.h>4#include <bpf/bpf_helpers.h>5#include "bpf_misc.h"6 7#if !defined(__clang__)8#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"9#endif10 11struct Small {12 long x;13};14 15struct Big {16 long x;17 long y;18};19 20__noinline int foo(const struct Big *big)21{22 if (!big)23 return 0;24 25 return bpf_get_prandom_u32() < big->y;26}27 28SEC("cgroup_skb/ingress")29__failure __msg("invalid indirect access to stack")30int global_func10(struct __sk_buff *skb)31{32 const struct Small small = {.x = skb->len };33 34 return foo((struct Big *)&small) ? 1 : 0;35}36